[docs] [issue30882] Built-in list disappeared from Python 2.7 intersphinx inventory

[Christoph Deil]

New submission from Christoph Deil:

We have a project where we sub-class `list`. Since recently our docs build is failing because the intersphinx inventory entry for `list` on Python 2.7 doesn't exist any more.

I think this is a regression, because Python 2.7 is supposed to be stable and other functions and classes here are still there, just "list" is missing:
https://docs.python.org/2.7/library/functions.html#func-list

Just in case someone else sees this issue, the Sphinx warning looks like this:
```
docs/api/pyregion.ShapeList.rst:7: WARNING: py:class reference target not found: list
```
if you have something like
```
class ShapeList(list):
    """My list sub-class"""
```

----------
assignee: docs at python
components: Documentation
messages: 297993
nosy: Christoph.Deil, docs at python
priority: normal
severity: normal
status: open
title: Built-in list disappeared from Python 2.7 intersphinx inventory
versions: Python 2.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30882>
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